Electric terminal fuse block



Aug. 9', 1927.

J. M GGUNN ELECTRIC TERMINAL FUSE BLOCK Filed July 14, 1925 John Mc. (7/0? Patented Aug. 9, 1927.

UNITED STATES PATENT OFFICE.

JOHN IOOLABY GUNN, OF LONDON, ONTARIO, CANADA, ASSIGNOR TO THE MGCLARY MANUFACTURING 00.,

OF LONDON, CANADA.

ELECTRIC TERMINAL FUSE BLOCK.

Application filed July 14, 1925, Serialll'o. 43,652, and in Canada June 5, 1925.

The principal objects of the invention are, to provide a terminal block particularly adapted for use in electric stoves, whlch wlll enable the ready assembly of any desired number of branch wire connections and will occupy therninjmum. amount of space.

The principal feature of the invention consists in the novel construction of the main terminal block and the branch wire service blocks, whereby the mains are safely '20 tionbeing through the line 22 of Figure 1;

Figure 3 is a transverse section of a main terminal and branch fuse block with the covers thereon, the section being on the line 33 of Figure 1.

Figure 4 is a sectional view similar to Figure 2, showing a modified construction of the porcelain blocks.

In the designing of a fuse block for use in electric stoves it is very necessary that the Hvarious connections be arranged as closely together as possible in a compact form so that they may be easily accessible and further that they may be effectively protected against short circuiting. v

In order to accomplish this result, I have devised a structure comprising a main terminal block 1 formed with recesses 2 in the top thereof opening to one side and into which are inserted the main electric feed wires 3.

The under side of the block is formed with transverse channels 4 arranged in alignment with the reces es 2 and connecting with the bottom of the recesses 2 through the slot openings 5 which are sufliciently deep to allow of the insertion of the flat bus bars 6.

Fastening bolts 7 extend through the terminal ends 8 of the feed wires 3 and through the bus bars 6, passing downwardly through the holes arranged centrally of the recesses 2 in the bottom of the block and said bolts are secured firmly in place by the nuts 9 which are housed in the recesses 10 in the underside of the block.

I Back of the recesses 2 and on the upper side of the block 1 is formed a flat recess 11 to receive a terminal bar- 12 in which are threaded a plurality-of binding screws 13 adapted to receive the ends of the branch wires 14. I

The bar 12 is rigidly secured in place by a bolt 15 extending through a hole in the centre of the bar and through a registering hole in the block 1, a fastening nut 16 being housed in a recess in the under side of the block.

The bolt 15 secures the terminal end 18 of the neutral wire of the circuit.

It will be noted that all the branch wires 14 are connectedto the neutral terminal 18 through the bar 12. I

A cap 19 is provided to cover the top of the block 1 having a projecting flange 20 to extend over the bar 12. a

The porcelain of the block 1 extends beyond the recess 11, being stepped down therefrom, thus forming a recess 21 for the branch wires 14 leading to the terminal bar 12. 4

The bus bars 6 project beyond the block 1 and upon these are mounted the branch wire fuse blocks 22. These are provided with transverse slots 23 in the underside to receive the bus bars and recesses 24 are formed in the top of the fuse blocks above the slots 23 and opening outwardly from the ends of the block.

Suitable fuse holding sockets 25 are housed in the recesses 24 and bolts 26 insulated from the sockets and formin central connections thereof pass through t e open ings in the block and engage threaded holes inthe bus bars. v

The blocks are formed with raised bosses 28 surrounding the bolt holes in the bottoms of the recesses and metal terminal strips 29 formed with circular ends engaging the bottom of the'sockets 25 are held in lace by the bolts 26 but insulated there rom by the said bosses and suitable insulating washers 30.

The strips 29 extend outward to the lateral opening portions of the recesses 24 and are provided with binding screws '31 to which the branch wires 32 of the branch circuits are connected.

Porcelain taps 33 fitting around the screw sockets 25 cover the terminal connections, being secured in place by thebolts 34. A

Any desirable number of the branch fuse blocks 22 may be placed upon a set of bus bars connected with a main fuse block according to the installation required, so that the minimum amount of space within the stove or other device, to which the invention is applied, will be occupied by the terminal fuse block.

Further, it will be noted that the line con tacts are all securely protected against accidental engagement by the caps 33 and 19 and unless these are removed a short circuit cannot be effected.

It may be found desirable to construct the porcelain blocks so that the one overlaps the other to prevent any possibility of short circuiting between the bus bars and Figure- 4 illustrates the manner of overlapping these blocks.

What I claim as my invention is 1. An electric terminal fuse block, C0111- prising a main terminal block having covered terminal recesses, bus bars leading from said terminal recesses and extending beyond said main block, fuse blocks mounted on the extended portions of said bus bars, and branch wire terminals arranged in said fuse blocks.

2. An electric terminal fuse block, comprising a main terminal block having covered terminal recesses, bus bars leading from said terminal recesses and extending beyond said main block, individual fuse blocks mounted on the extending portions of said bus bars and havin pockets therein opposite said bus bars, f use sockets arranged in said ockets in said fuse blocks and having brantfii wire terminals and centre contacts for said fuse sockets extending from said ered terminal recesses, bus bars leading from .said terminal recesses and projecting freely beyond said main block, individual fuse blocks of insulating material mounted on the projecting portions of said bus bars independent of the main block and having transverse recesses in the underside accommodating the bus bars, recesses in the top side leading outwardly through the ends of the block and having holes communicating with the underside recesses, fuse sockets in said recesses, centre contact screws extending through the said holes and engaging the bus bars, side terminal contacts arranged in said upper recesses and having binding screws to receive the branch connections, and insulating caps closing in said branch wire connections.

4. An electric terminal fuse block, comprising a porcelain block havin recesses in the upper side to receive the main line leads, recesses in the underside connectin with said upper recesses, bus bars extending between said upper and lower recesses and connected with the main line leads, a plu rality of branch line fuse blocks secured to said bus bars, a neutral terminal arranged in said orcelain block and having a plurality of binding posts thereon, and a cap covering said neutral bus bar and said main terminal recesses. I

JOHN McGLARY GUNN. 

